Is there any standard sized extended batteries out there that don't change the form factor of the phone but give more juice?
Yeah it fits fine it also makes the phone a lil more lighter then it already is
Sent from my SAMSUNG-SGH-I777 using xda premium
Is there any standard sized extended batteries out there that don't change the form factor of the phone but give more juice?
Yes. There is a very reliable one where I bought several times from them.
mugen-power-batteries.com
Normally for one model they have the standard size with extend capacity and another super size with 2-3 times capacity of the standard one. I have tried HTC Sensation's extended battery, works great on my HTC.
Hope you can find what you need. Besides, they ship to all over the world for free!